0.12%~0.16%C铬钼钢连铸板坯表面纵裂的控制  

Control of Casting Slab Surface Longitudinal Cracks of 0.12%~0.16%C Chromium Molybdenum Steel

作　　者：李杰[1,2] 郑京辉 刘小军 李双江 张飞 

机构地区：[1]河北钢铁技术研究总院,石家庄050000 [2]北京科技大学钢铁共性技术协同创新中心,北京100083 [3]河北钢铁集团舞钢公司,舞钢462500

出　　处：《特殊钢》2016年第2期32-35,共4页Special Steel

摘　　要：12Cr2Mo,14CrMo和15CrMo钢的生产流程为铁水-110 t BOF—LF—VD-300 mm×（1700~2400）mm板坯CC工艺。分析了钢中碳含量,Mn/S,结晶器倒锥度,结晶器冷却工艺和保护渣,浸入式水口插入深度等因素对连铸板坯表面纵裂的影响。通过将优化前3种钢的结晶器倒锥度1.10优化成12Cr2Mo钢1.20,14CrMo钢1.15,15CrMo钢1.10,浸入式水口的插入深度由原先的170~180 mm调整到140~150 mm,使用粘度较低的保护渣（碱度1.25,1300℃粘度0.129 Pa·s）,以增加渣液的流动性,连铸板坯表面纵裂缺陷得到了有效的控制,纵裂率由原先的8.9%降低到优化后的3.2%。The Production flowsheet for steel 12Cr2Mo, 14CrMo and 15CrMo is metal-110 t BOF-LF-VD-300 mm× （ 1 700 -2 400）mm sial） CC process. The effect of faetors including carbon content in steel, Mn/S, mold inverted taper＂ and immersion nozzle insertion depth on casting slab longitudinal cracks is analyzed. By optimizing the mold inverted taper from before oplimization 1. 10 for Ihree kinds of steel tn 1.20 for steel 12Cr2Mo, 1.15 for steel 14CrMo and 1.10 for steel 15CrMo, adjusting the immersion nozzle insertion depth from original 170 - 180 mm to 140 - 150 ram, and using lower vis- cosily mohl powder （ basicity 1.25, viscosity 0. 129 at 1 300 ~ ） to increase the flux flnwability, the casting slab surface longitudinal eraeks defect is effecliw,ly controlled, the hmgitudinal cracks oceun＇ed rate decreases from original 8.9% to 3. 2% after optimization.

关 键 词：0.12%~0.16%C铬钼钢 300mm连铸板坯 表面纵裂 保护渣 结晶器倒锥度 浸入式水口 工艺优化 

分 类 号：TF777[冶金工程—钢铁冶金]